mb/purism/librem*: drop EC chip device

CB:35086 exposed that the devicetree listed an EC chip for which there
is no actual driver; the EC is entirely ACPI code (.asl) included by
the board's ec.asl. Remove the unnecessary EC chip driver from both
boards, as well as the unnecessary Kconfig selection for librem_bdw.

Test: build/boot Librem 13v1, 13v4, verify battery info etc still correct.

Signed-off-by: Matt DeVillier <matt.devillier@puri.sm>
Change-Id: I5cb0b51881ab8f14e9ec693485f673f4284b5f14
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41788
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/mainboard/purism/librem_bdw/Kconfig

@@ -2,7 +2,6 @@ config BOARD_PURISM_BASEBOARD_LIBREM_BDW
 	def_bool n
 	select SYSTEM_TYPE_LAPTOP
 	select BOARD_ROMSIZE_KB_8192
-	select EC_PURISM_LIBREM
 	select HAVE_ACPI_RESUME
 	select HAVE_ACPI_TABLES
 	select INTEL_GMA_HAVE_VBT

src/mainboard/purism/librem_bdw/devicetree.cb

@@ -52,11 +52,7 @@ chip soc/intel/broadwell
 		device pci 1c.5 on  end # PCIe Port #6 - M.2 NVMe
 		device pci 1d.0 off end # USB2 EHCI
 		device pci 1e.0 off end # PCI bridge
-		device pci 1f.0 on
-			chip ec/purism/librem
-				device pnp 0c09.0 on end
-			end
-		end # LPC bridge
+		device pci 1f.0 on  end # LPC bridge
 		device pci 1f.2 on  end # SATA Controller
 		device pci 1f.3 on  end # SMBus
 		device pci 1f.6 off end # Thermal

src/mainboard/purism/librem_skl/devicetree.cb

@@ -208,9 +208,6 @@ chip soc/intel/skylake
 		device pci 1d.2 off end # PCI Express Port 11
 		device pci 1d.3 off end # PCI Express Port 12
 		device pci 1f.0 on
-			chip ec/purism/librem
-				device pnp 0c09.0 on end
-			end
 			chip drivers/pc80/tpm
 				device pnp 0c31.0 on end
 			end